Cylinder head work

Saturday, June 10. 2006

Posted by 505turbo

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Ported 505 turbo head

I've always been curious to see how efficient the 505 turbo cylinder head is. I had a spare cylinder head, and got hooked up with a recommended cylinder head shop with a flow bench, 4 months later I picked this up.

The spare head I had was cracked (of course

), so this place did the works. Fixed the crack, complete valve job, resurface, and porting work. I asked that they just do mild porting because I didn't want to go completely nuts, but that didn't seem to soak in. Anyway, they said they made some huge increases (especially from the exhaust side), and that they can't wait to see how it works. I'm optimistic, so we'll see.

This data is copied directly from the chart they gave me with the head. The figures were taken using 28.00 inches of water (which is the norm from what I understand).

(Discussion on this topic can be found here: http://www.505turbo.com/forum/index.php?showtopic=373)

The full list of high-res images can be found here:
http://www.505turbo.com/86505/ported_cylinder_head/masters/

Valve Spring Assembly
Installed Height	1.495
Seat Pressure	109
Open Pressure	182
Open Height	1.100
Coil Bind	1.030
Seal / Retainer	.425

Intake	Complete CFM		CFM Difference		Percent Difference
Lift	Before	After	Before	After	Before	After
0.100	66.4	72.1	N/A	5.7	N/A	8.5
0.150	88.3	97.7	N/A	9.5	N/A	10.7
0.200	116.3	126.9	N/A	10.5	N/A	9.0
0.250	143.6	153.2	N/A	9.6	N/A	6.7
0.300	164.4	178.5	N/A	14.1	N/A	8.6
0.350	175.3	195.5	N/A	20.2	N/A	11.5
0.400	177.7	205.5	N/A	27.8	N/A	15.7
0.450	176.3	212.7	N/A	36.5	N/A	20.7
0.500	178.2	218.2	N/A	40.0	N/A	22.4

Exhaust	Complete CFM		CFM Difference		Percent Difference
Lift	Before	After	Before	After	Before	After
0.100	49.3	63.7	N/A	14.4	N/A	29.2
0.150	71.6	84.5	N/A	13.0	N/A	18.2
0.200	92.7	104.1	N/A	11.4	N/A	12.3
0.250	111.1	125.5	N/A	14.4	N/A	13.0
0.300	122.2	145.3	N/A	23.1	N/A	18.9
0.350	129.1	160.9	N/A	31.8	N/A	24.6
0.400	132.1	169.7	N/A	37.6	N/A	28.5
0.450	132.9	172.4	N/A	39.5	N/A	29.7
0.500	133.0	172.9	N/A	39.9	N/A	30.0

Top View:

Surface

Exhaust ports

Intake ports

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